ios - UICollectionView reloadData - EXC_BREAKPOINT

Question

我的 UITableView 标题中有一个 UICollectionView。如果没有数据，我会删除 collectionView。 我在行“self.collectionView.reloadData()”

中遇到 EXC_BREAKPOINT 崩溃

var reccomend: [JSON]? = []

 func loadReccomend(){
            YazarAPI.sharedInstance.loadReccomendedArticles({ reccomend in
                if let data = reccomend["articles"].arrayValue as [JSON]?{
                    self.reccomend = data
                    if (self.reccomend?.count)! < 1 {
                        self.tableView.tableHeaderView = nil
                    }else{
                        self.collectionView.reloadData()
                    }
                }
            })
        } 

    func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
                return 1
            }

            func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
                return self.reccomend?.count ?? 0
            }

            func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
                let cell = collectionView.dequeueReusableCellWithReuseIdentifier("ReccomendCell", forIndexPath: indexPath) as! ReccomendedCollectionViewCell
                cell.article = self.reccomend?[indexPath.row]
                return cell
            }

print(data) 的结果:

[{
  "title" : "title0",
  "author_email" : null,
  "author_id" : 1884,
  "read_count" : 0,
  "is_favorite" : false,

}, {
  "title" : "title1",
  "author_email" : null,
  "author_id" : 1884,
  "read_count" : 0,
  "is_favorite" : false,

}]

Answer 1

尝试在你的 else 部分使用 guard:

 guard self.reccomend?.count > 0 else{
       return
    }
 self.collectionView.reloadData()